package com.aimer.filter;

import com.aimer.domain.UserLogin;
import com.aimer.utils.JwtUtil;
import com.aimer.utils.RedisCache;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;
@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        // 获取token
        String token = httpServletRequest.getHeader("token");

        // 判断token是否存在
        if (!StringUtils.hasText(token)) {
            filterChain.doFilter(httpServletRequest,httpServletResponse);
            return;
        }

        // 解析token
        String userId;
        try {
            Claims claims = JwtUtil.parseJWT(token);
            userId = claims.getSubject();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        // 从redis中获取用户信息
        String redisKey = "login:" + userId;
        UserLogin userLogin = redisCache.getCacheObject(redisKey);
        if (Objects.isNull(userLogin)){
            throw new RuntimeException("用户未登录");
        }
        // 将用户信息存入
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(userLogin,null,userLogin.getAuthorities());
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);

        // 放行
        filterChain.doFilter(httpServletRequest,httpServletResponse);

    }
}
